(PHP 4, PHP 5, PHP 7)
is_bool — Finds out whether a variable is a boolean
is_bool ( mixed $var ) : bool
Finds whether the given variable is a boolean.
var
The variable being evaluated.
Returns true
if var
is a bool, false
otherwise.
Example #1 is_bool() examples
<?php $a = false; $b = 0; // Since $a is a boolean, it will return true if (is_bool($a) === true) { echo "Yes, this is a boolean"; } // Since $b is not a boolean, it will return false if (is_bool($b) === false) { echo "No, this is not a boolean"; } ?>
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https://www.php.net/manual/en/function.is-bool.php